Isimiso sokubumba umjovo wesikhunta se-carbide esisimende Kunembobo yokudla esikhunjeni, exhunywe emgodini wesikhunta ovaliwe womjovo ngokusebenzisa isistimu yokuvula engaphakathi kwesikhunta. Lapho usebenza, udinga kuqala ukufaka okuqinile okubumbayo endaweni yokudla bese uyishisa ukuze uyiguqule ibe yisimo sokugeleza kwe-viscous. Bese usebenzisa i-plunger ekhethekile ukuze ucindezele ukuncibilika kwepulasitiki endaweni yokudla emshinini wokunyathelisa, ukuze ukuncibilika kudlule esikhunjini. Uhlelo lokuthulula lungena emgodini wesikhunta esivaliwe futhi lenze ukugcwaliswa kokugeleza. Lapho ukuncibilika kugcwala isikhunta, futhi ngemva kokubamba ingcindezi efanele kanye nokuqina, isikhunta singavulwa ukuze sisuse umkhiqizo. Njengamanje, ukubumba umjovo kusetshenziswa ikakhulukazi imikhiqizo yepulasitiki ye-thermoset.
Uma kuqhathaniswa nokubunjwa kokucindezelwa, ukubumba komjovo we-carbide okuhlanganisiwe kunepulasitiki eyenziwe ngepulasitiki ngaphambi kokungena emgodini, ngakho-ke umjikelezo wokubumba mfushane, ukusebenza kahle kokukhiqiza kuphezulu, izingxenye zepulasitiki zinokunemba okuphezulu, ikhwalithi enhle, futhi akukho flash. Mncane kakhulu; ingabumba izingxenye zepulasitiki ngokufaka okuncane, izimbobo eziseceleni ezijulile kanye nezingxenye zepulasitiki eziyinkimbinkimbi; idla izinto ezingavuthiwe ezengeziwe; izinga le-shrinkage lokubunjwa komjovo likhulu kunezinga le-shrinkage lokubunjwa kokucindezela, okuzothinta ukunemba kwezingxenye zepulasitiki, kodwa ngempushana Izingxenye zePlastiki ezigcwele izigcwalisi zokuma azinawo umphumela omncane; isakhiwo sesikhunta se-cemented carbide injection siyinkimbinkimbi kunesikhunta sokucindezela, ingcindezi yokubumba iphakeme, futhi umsebenzi wokubumba unzima kakhulu. Ukubumba komjovo kusetshenziswa kuphela lapho ukubumba kokucindezelwa kungakwazi ukuhlangabezana nezidingo zokukhiqiza. Ukubunjwa komjovo kulungele ukubunjwa kwezingxenye zepulasitiki ze-thermosetting ezinobunjwa obuyinkimbinkimbi nokufakwa okuningi.
Imingcele yenqubo eyinhloko ye-cemented carbide mold injection molding ihlanganisa ingcindezi yokubumba, izinga lokushisa lokubumba kanye nomjikelezo wokubumba, njll. Zonke zihlobene nezici ezifana nohlobo lwepulasitiki, isakhiwo sesikhunta, nezimo zomkhiqizo.
(1) Ingcindezi yokubumba isho ingcindezi ekhishwa umshini wokucindezela ekuncibilikeni kwegumbi lokuphakela ngekholomu yokucindezela noma i-plunger. Njengoba kukhona ukulahlekelwa kwengcindezi lapho ukuncibilika kudlula ohlelweni lokungena, ingcindezi yokubumba ngesikhathi sokujova ingcindezi ngokuvamile iba izikhathi ezi-2 kuya kwezingu-3 lapho kubumba ukucindezela. Ingcindezi yokubumba ye-phenolic plastic powder kanye ne-amino plastic powder ngokuvamile i-50 ~ 80MPa, futhi ingcindezi ephakeme ingafinyelela ku-100 ~ 200MPa; amapulasitiki ane-fiber filler angama-80 ~ 160MPa; amapulasitiki okupakisha anengcindezi ephansi njenge-epoxy resin ne-silicone angu-2~ 10MPa.
(2) Izinga lokushisa elibunjwayo lesikhunta se-carbide esine-cemented lihlanganisa izinga lokushisa lempahla ekamelweni lokudla kanye nezinga lokushisa lesikhunta ngokwaso. Ukuze uqinisekise ukuthi okokusebenza kunoketshezi oluhle, izinga lokushisa lempahla kufanele libe ngaphansi ngokufanelekile kunezinga lokushisa elixhumanisa izinto eziphambanayo ngo-10 ~ 20°C. Njengoba ipulasitiki ingathola ingxenye yokushisa kwe-friction lapho idlula ohlelweni lokuthulula, izinga lokushisa lekamelo lokudla kanye nesikhunta kungaba ngaphansi. Izinga lokushisa lesikhunta lokubumba umjovo livamise ukuba ngu-15~30℃ eliphansi kunalelo lokubunjwa kokucindezelwa, ngokuvamile libe ngu-130~190℃.
(3) Umjikelezo wokubumba umjovo wesikhunta se-carbide esine-cemented uhlanganisa isikhathi sokudla, isikhathi sokugcwalisa isikhunta, isikhathi sokuxhumanisa kanye nesikhathi sokuphulukisa, isikhathi sokudiliza sokuthatha izingxenye zepulasitiki, nesikhathi sokususa isikhunta. Isikhathi sokugcwalisa sokubunjwa komjovo ngokuvamile siyimizuzwana emi-5 kuya kwezingu-50, kuyilapho isikhathi sokuphulukisa sincike ohlotsheni lwepulasitiki, ubukhulu, ukuma, ukushuba kodonga, izimo zokushisa kanye nesakhiwo sesikhunta sengxenye yepulasitiki, futhi ngokuvamile imizuzwana engu-30 kuya ku-180. Ukubumba umjovo kudinga ukuthi ipulasitiki ibe noketshezi olukhulu ngaphambi kokufinyelela izinga lokushisa eliqinile, futhi ngemva kokufinyelela izinga lokushisa eliqinile, kufanele libe nesivinini esisheshayo sokuqina. Izinto ezisetshenziswa kakhulu zokubumba umjovo zifaka: amapulasitiki e-phenolic, i-melamine, i-epoxy resin namanye amapulasitiki.
Isikhathi sokuthumela: Sep-18-2024
